Prizma-EP - overview
IBM Power Packet Routing Switch 64G
The Prizma-EP (IBM PowerPRS 64G) is one of a family of second-generation switching devices designed for high-performance, nonblocking, fixed-length packet switching. This device is a single-chip switch element which exploits the performance advantage of the shared-output queuing structure and from which larger, self-routing single-stage or multi-stage switch fabrics can be constructed in a modular way. Prizma-EP is a 32x32@2Gb/s per port switching element, which enables the development of scalable switch fabrics with an aggregate bandwidth of 64 to 512 Gb/s. Internal and external speed expansion, port expansion, and port-paralleling configurations provide options for scaling the combination of port speed and the number of ports.
Prizma-EP builds on the Prizma packet routing switch architecture developed at IBM's Research Laboratory in the past decade . The key features of the Prizma switch architecture are very high performance achieved by a strict separation of control and data paths, efficient queuing algorithms, and very large-scale integration on a single chip. This provides a unique level of flexibility, enabling multiple chips to be combined in many ways to build a broad range of communication nodes.
Whereas the initial Prizma switch architecture relied solely on output buffering (using a "shared memory" switch chip), the current architecture combines virtual-output queuing and output buffering . This gives the switch its very high performance, independent of packet size.
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